A multi-needle assembly according to the present invention includes: a plurality of needles a central hub for supporting the needles with the front part of the needles exposed and the rear part thereof fixedly surrounded a suction cap with the front having needle penetration holes for receiving the needles, the suction cap surrounding the needles and in a sealed manner one side of the central hub and an adjustment part rotatably connected to the rear end of the suction cap and screwed around one side of the central hub for moving the central hub forward or backward with regard to the suction cap by rotation so as to adjust the length of exposure of the needles, wherein the adjustment part has one side inscribed with continuous numbers or a scale around. Thus the exposed length of the needles may be easily adjusted and confirmed as being desired, so that easy treatment is possible without an additional means for confirming.
